I’ve attached three screenshots (e1, e2, e3). On the first you can see that the bloc has attributes so it is only visible in the mobile view.
On the second the selected bloc is only visible on desktop and tablet.
On the third an alternative approach, the bloc is visible on all platforms, but the bloc content varies according to platform and I’ve added a mobile-only paragraph and the other paragraphs are tablet/desktop - only. On the e3 screenshot you can see the mobile-only paragraph is darkened and the selected paragraph is desktop/tablet only.
See here: http://ipauland.com/test1.bloc.zip and http://ipauland.com/test2.bloc.zip
Hope that helps.